In summary, everyone has a Right to travel.
Only people who use a vehicle for transportation of humans or cargo in exchange for money need a licence.
If you are traveling for your own private reasons, then you are using an automobile.
Registration was originally used to prevent theft and allow cops to question people who are registered to make sure they are operating their own vehicle.
Many are realizing this and no longer participating with the DMV "requirements". For example, one man in Texas got pulled over 9 times and they let him go 8 times. The one time he went to jail, he sued for $4,000,000 for false arrest.
Here is a video explaining the laws behind it.
After a while the cops will change their policies on stopping cars. Its inevitable.
There are only a few laws that have to be memorized that are very important. Of course the Constitution and all laws written in the Common Law handbook.
As far as a lawsuit, you can partner up with a lawyer on that for sure as partners meaning if anything should happen to you, he sues for you and you 2 split the millions of dollars you make 50/50. It is always important to film all encounters to present them in court.
Why do you think they want to lose their job? If cops don't do what is in their orders and instructions, they lose their job.
Authorities don't care about Constitution or Common Law. If it would be necessary, they will easily change them.
Let us agree to disagree Agent Smith.